Unit 9 Retest

Front

How many lines of symmetry does a shape with 1 line of symmetry have?

Back

A shape with 1 line of symmetry can be folded along that line so that both halves match exactly.

Front

What is the rule for translating a point in the coordinate plane?

Back

The rule for translating a point (x, y) is given by (x, y) → (x+a, y+b), where 'a' and 'b' are the horizontal and vertical shifts, respectively.

Front

Dilate Point B (2, 4) by a scale factor of 3. What is the new coordinate?

Back

(6, 12) - The coordinates are multiplied by the scale factor.

Front

What does it mean to reflect a shape over the y-axis?

Back

Reflecting a shape over the y-axis means that each point (x, y) of the shape is transformed to (-x, y).

Front

If you translate a point (1, 5) 3 units to the left and 9 units down, what is the new coordinate?

Back

(-2, -4) - The new coordinates are found by subtracting from the original coordinates.

Front

What is the scale factor in dilation?

Back

The scale factor is a number that describes how much a shape is enlarged or reduced during dilation.

Front

How do you determine the center of dilation?

Back

The center of dilation is the fixed point in the plane about which all points are expanded or contracted.

Front

What is the effect of a scale factor less than 1 in dilation?

Back

A scale factor less than 1 reduces the size of the shape.

Front

What is the effect of a scale factor greater than 1 in dilation?

Back

A scale factor greater than 1 enlarges the size of the shape.

Front

What is a pre-image in geometry?

Back

A pre-image is the original figure before any transformation is applied.